Guillaume Pousaz Net Worth

Guillaume Pousaz has an estimated net worth of $7.8 billion, according to Forbes Real-Time Billionaires, Guillaume Pousaz profile (figures as of October 20, 2026). That is down from a peak of $23 billion.

Guillaume Pousaz is a Swiss entrepreneur and investor best known for starting Checkout.com, a payment platform. He began working in payments in 2006 at International Payments Consultants. He later co-founded NetMerchant, a money transfer service between the US and Europe. In 2009, he bought SMS Pay to build a next generation payments gateway and also started Opus Payments in Singapore, helping businesses in Hong Kong take payments from buyers around the world.

Opus Payments became Checkout.com in 2012. The company was built to make online payment processing easier for merchants and shoppers worldwide. Pousaz stayed on as CEO and kept a large ownership stake, with Forbes saying he owns nearly two-thirds of the London-based business. Checkout.com grew fast, including a 2019 funding round that valued the company at $2 billion, then a January 2022 raise of $1 billion that valued the company at $40 billion.

How Guillaume Pousaz built his wealth

Pousaz made his money in fintech, mainly through his stake in Checkout.com. Before that company took off, he built experience across payments and money transfer. He worked at International Payments Consultants, helped launch NetMerchant, and bought SMS Pay to develop a next generation payments gateway. Those steps gave him a base in cross-border payments before he turned Opus Payments into Checkout.com in 2012.

His wealth is tied closely to the value of Checkout.com and to the size of his ownership. Forbes says he owns nearly two-thirds of the company, which is based in London, and he remains CEO. The business took outside capital in 2019, then raised more in 2021 and again in 2022. Outside of Checkout.com, he also set up Zinal Growth in 2021, a family office focused on European technology investments.

How the Forbes estimate moved

Forbes has tracked sharp swings in Pousaz's fortune as fintech valuations moved up and down. On the Forbes World's Billionaires List, he was at $9 billion in 2021, then $23 billion in 2022 after Checkout.com raised $1 billion from private investors at a $40 billion valuation in January 2022. Later that year, the company cut its internal valuation to $11 billion as fintech valuations fell.

The lower company valuation fed into later Forbes estimates. Pousaz was listed at $7.2 billion in 2023, and a year later Checkout.com lowered its internal valuation again to $9.35 billion. In 2025, the company said its valuation rose to $12 billion. Forbes currently puts him at $7.8 billion on its real-time billionaires tracker as of October 20, 2026, matching its 2024, 2025, and 2026 annual list figure.